The High-accurate Extraction of Line Features of Object Contour

A high-accurate extraction algorithm of line features of object contour is proposed in this paper,which combines the method of exact positioning of single point and the algorithm of line segment approximation with minimum-distance error.First object contour can be approximated exactly by linear feature.Then we search the adjacent line segment and compute the intersection point between them.At last,we realized the exact positioning of contour feature point and provided exact line segment data for 3D measuring and reconstruction based on contour.In contrast to other approaches(such as least squares template matching and parabola fitting methods),the algorithm proposed in this paper has not need good initial value of contour and can get better extraction result.An example is performed to verify the viewpoint.